He's a wide load, so he has to wait for a big enough driving lane - fortunately, today's spacing provides the wide lanes to minimize that Lebron-ball wait time:
However, if Lebron faced the same spot with NO spacing, he wouldn't be able to fit in there and attack immediately like other wing players who have with slimmer, more optimal physiques.
Lebron-ball already takes fairly long to act in today's spacing, but he'd take even longer with no-spacing and the smaller driving/passing lanes of previous eras.. Lebron would've taken longer than Barkley..